Indication of meta-anthracite by magnetotellurics in the Kőszeg-Rechnitz Penninic window: a test area

Ádám, A. and Novák, A. and Prácser, E. and Szarka, L. and Wesztergom, V. (2013) Indication of meta-anthracite by magnetotellurics in the Kőszeg-Rechnitz Penninic window: a test area. ACTA GEODAETICA ET GEOPHYSICA HUNGARICA, 48 (3). pp. 281-292. ISSN 2213-5812 (Print) 2213-5820 (Online)

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Abstract

One of the Penninic Nappes is the Kőszeg-Rechnitz (K-R) tectonic window at the Eastern end of the Eastern Alps. It has a complicated metamorphic history from the Jurassic time. The organic material of the Penninic Ocean was transformed to electrically conductive meta-anthracite. Its amount in the chalcophyllite is estimated by geochemists to 0.2 per cent. Taking this conducting structure as a test area pilot deep magnetotelluric (MT) soundings have been carried out and we determined – the structure of the conductivity anomaly due to 0.2 per cent meta anthracite in the K-R window and its surroundings – the different kinds of MT distortions as lateral (side) effect of the conductor appearing in the crust and mantle – the most probable depth of the conductive asthenosphere at the border of the Pannon- ian Basin (having extreme shallow asthenosphere). The obtained ∼ 140 km depth is in correlation with value of the asthenospheric map based mainly on seismic data.

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